This bowling ball ships PRE-DRILLED. There are 5 sizes and the sizes that we drill are based on the weight of the ball. X-Small: 6lbs- Ages 8 and under, Small: 8lbs and 9lbs- Ages 8-11 and womens ring size from 8-11, Medium: 10lbs, 11lbs, and 12lbs, Ages 11-15 and Adult Ring size 10 or lower, Large: 13lbs and 14lbs, Mens ring size 10-12 or people with larger hands, X-Large: 15lbs and 16lbs, Mens ring size over 13 or people with extremely large hands. If you would like a different size drilled for the weight you selected, you must contact us via email as soon as your order is placed with your order number. Pre-Drilled bowling balls cannot be returned or exchanged. The Radioactive Vibe was the boldest-looking Vibe ever produced, and it rolls incredibly. We are kicking the boldness and performance of the line up a notch with the new Arctic Vibe. This Vibe will stand out for its bright white and purple mix, and its screaming backend. Hammer has not produced many two-color Vibes or hybrid options; the Arctic Vibe was strategically developed to enhance the line and not replace the two previously released Vibes since they are still going strong. HK22 – CT Reactive Max is undoubtedly too much cover for this price point, it causes the Arctic Vibe to outperform anything in its category, and that’s ok because Hammerheads will love it! PERFORMANCE: Mid COLOR: Snow/Purple CORE: Vibe COVERSTOCK: HK22 - CT Reactive Hybrid COVER TYPE: Hybrid Reactive FINISH: 500, 1000, 1500 Siaair / Factory Compound WEIGHTS: 16-10 Pounds LANE CONDITION: Light to medium oil REACTION: Strong mid-lane and backend WARRANTY: Two years from purchase date